Making the case for contemporary music is Schreiber, editor of the Internet publication Pitchfork and a champion of contemporary rock. And in the old-school corner is Thompson, critic and author of the classic-rock manifesto I Hate New Music.

As guest DJs, they spin select tracks to intensify the debate, pitting M.I.A. against Focus and Bon Iver against Thin Lizzy. Delving into some of the core dividing issues, the rivals discuss how the Internet has affected the process of music discovery, and how musicians draw from prior eras.

This story was originally aired on May 21st, 2009.